Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-05-06
Phys.Lett.B695:157-161,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 2 figures; typos corrected, comments and references added, to appear in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2010.10.056
A possible extension of the Standard Model to include lepton number as local gauge symmetry is investigated. In such a model, anomalies are canceled by two extra fermions doublet. After leptonic gauge symmetry spontaneously broken, three active neutrinos may acquire non-zero Majorana masses through the modified Type-II seesaw mechanism. Constraints on the model from electro-weak precision measurements are studied. Due to the $Z_2$ discrete flavor symmetry, right-handed Majorana neutrinos can serve as cold dark matter candidate of the Universe. Constraint from dark matter relic abundance is calculated.
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